Denis Fedorchenko
Software Engineer at Sigma Software Group
Ukraine
Summary
🤩
Rockstar🎓
Top SchoolDenis Fedorchenko is a software engineer with 8 years of experience building backend systems, currently working at Sigma Software Group and previously contributing to Openware and Helios Technologies. He specializes in secure, production-grade Rails services for financial and crypto platforms, having improved logging, error handling, and secret management (including Vault-Rails) in the open-source Peatio exchange. Denis also implemented authentication and label-management features in Barong, adding API key workflows and OTP validation to strengthen account security and admin tooling. Based in Ukraine, he combines a formal Computer Science background from NTUU KPI with hands-on open-source contributions that touch critical admin and auditing surfaces. Notably, his work emphasizes observability and operational clarity—refactoring logs to JSON and exposing explorer data for admin diagnostics—helping teams run complex systems with safer defaults.
8 years of coding experience
3 years of employment as a software developer
Igor Sikorsky Kyiv Polytechnic Institute
Ukrainian, Russian, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (19)
json10
ruby-rails10
grapesjs10
apidoc10
rspec10
authentication10
user-authentication10
rails10
ruby10
api10
gr10
jwt10
error-handling10
ruby-on-rails10
mysql9
Programming languages (8)
Github contributions (5)
openware/barong
Nov 2018 - Jun 2020
Barong auth server
Role in this project:
Back-end Developer
Back-end DeveloperContributions:11 reviews, 28 commits, 24 PRs in 1 year 7 months
Contributions summary:Denis primarily contributed to the `openware/barong` authentication server by implementing and modifying the Label Model. These changes include adding and updating models, as demonstrated through modifications to the `label_spec.rb` and `label.rb` files. This involved managing user levels based on label assignments, with added API endpoints for labels management. Further development encompasses the creation of an API for API keys, including functionalities for creating, modifying, and deleting keys with OTP validation.
oauth-serverbarongauthenticationblockchainpeatio
openware/peatio
Jun 2019 - Aug 2021
Open-source crypto currency exchange software (https://openware.com)
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 reviews, 36 commits, 43 PRs in 2 years 2 months
Contributions summary:Denis primarily focused on improving the logging and error handling within the cryptocurrency exchange software. They refactored the logging format to JSON for consistency, updated the logger in the withdraw coin daemon for better clarity, and incorporated Vault-Rails for secure storage of sensitive data like secrets and settings. Additionally, the user added several endpoints for administration, including actions on withdraws and deposits, along with exposing explorer transaction and address information in the admin API.
exchangeethereumcrypto-exchange-softwaretrading-platformcurrency-exchange
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